#include <iostream>
#include <pthread.h>
#include <exception>
#include <semaphore.h>
#include <unistd.h>
using namespace std;
class sem
{
public:
    sem()
    {
        if (sem_init(&m_sem, 0, 0) != 0)
        {
            throw std::exception();
        }
    }
    sem(int num)
    {
        if (sem_init(&m_sem, 0, num) != 0)
        {
            throw std::exception();
        }
    }
    ~sem()
    {
        sem_destroy(&m_sem);
    }
    bool wait()
    {
        return sem_wait(&m_sem) == 0;
    }
    bool post()
    {
        return sem_post(&m_sem) == 0;
    }

private:
    sem_t m_sem;
};
class locker
{
public:
    locker()
    {
        if (pthread_mutex_init(&m_mutex, NULL) != 0)
        {
            throw std::exception();
        }
    }
    ~locker()
    {
        pthread_mutex_destroy(&m_mutex);
    }
    bool lock()
    {
        return pthread_mutex_lock(&m_mutex) == 0;
    }
    bool unlock()
    {
        return pthread_mutex_unlock(&m_mutex) == 0;
    }
    pthread_mutex_t *get()
    {
        return &m_mutex;
    }

private:
    pthread_mutex_t m_mutex;
};
class cond
{
public:
    cond()
    {
        if (pthread_cond_init(&m_cond, NULL) != 0)
        {
            //pthread_mutex_destroy(&m_mutex);
            throw std::exception();
        }
    }
    ~cond()
    {
        pthread_cond_destroy(&m_cond);
    }
    bool wait(pthread_mutex_t *m_mutex)
    {
        int ret = 0;
        //pthread_mutex_lock(&m_mutex);
        ret = pthread_cond_wait(&m_cond, m_mutex);
        //pthread_mutex_unlock(&m_mutex);
        return ret == 0;
    }
    bool timewait(pthread_mutex_t *m_mutex, struct timespec t)
    {
        int ret = 0;
        //pthread_mutex_lock(&m_mutex);
        ret = pthread_cond_timedwait(&m_cond, m_mutex, &t);
        //pthread_mutex_unlock(&m_mutex);
        return ret == 0;
    }
    bool signal()
    {
        return pthread_cond_signal(&m_cond) == 0;
    }
    bool broadcast()
    {
        return pthread_cond_broadcast(&m_cond) == 0;
    }

private:
    //static pthread_mutex_t m_mutex;
    pthread_cond_t m_cond;
};

int main()
{
    locker lock1;
    locker lock2;
    if(fork() > 0)
    {
        // father
        cout << "father is run" << endl;
        lock2.lock();
        sleep(3);
        cout << "father getting lock1" << endl;
        lock1.lock();
        cout << "father getting lock2" << endl;
        
        lock2.unlock();
        cout << "father unlock lock2" << endl;
        lock1.unlock();
        cout << "father unlock lock1" << endl;
    }
    else
    {
        // son fork() == 0
        cout << "son is run" << endl;
        lock1.lock();
        sleep(3);
        cout << "son getting lock1" << endl;
        lock2.lock();
        cout << "son getting lock2" << endl;
        lock1.unlock();
        cout << "son unlock lock1" << endl;
        lock2.unlock();
        cout << "son unlock lock2" << endl;
    }
}